21 replies to this topic

[frax]

Thanks - I'll take a peek at those!

[frax]

Ok,

I managed to get something useful, but the workflow got kind of convoluted...

• The original coordinates were lat/long
• Brought these up in ArcMap and projected these
• Used the disperse markers to prevent overlap
• Exported the representation to the actual data
• Got the new x/y coords in the projected coordinate system (after dispersion) and added them as attributes (using Hawth's tools)
• Did some magic in MS Access using the above attributes + the network data to get a table of: fromx, fromy, tox, toy, flow unit
• Then used the NodeXML template for Excel to play with this data, and to get nice vertices/edges (network mapping lingo)
• Recalculated the x/y coords so that they were within 0-90
• Exported from NodeXML as graphml and opened this up in Gephi
• In Gephi I ran a geo-plugin to map these coordinates in a fake equirectangular coordinate space
• Exported as SVG from Gephi
• Bringing the resulting svg linework into my illustration and aligning it
• Final touchup in Illustrator
• the exported svg keeps the direction of the flows, I could use this in Illy to illustrator the direction of the arrows using art brushes (gray-color)
• In the resulting map, the color + width of the line displays the magnitude (five classes) in the unit of the flow.

NodeXML is a template for Excel that has come out of Microsoft Research recently, I was more home in editing and playing with the data there, rather than Gephi (which has a funky user interface). Unfortunately NodeXML doesn't support exporting to any vector format (nor the nice arcs that I got out of Gephi). http://nodexl.codeplex.com/

Attached Files

•  Clipboard01.png   68.61K   58 downloads

[frax]

Wow, amazing that I had noted down all those steps - I had to redo this analysis/map again now, and I had not kept any notes on it around - but then I remembered that I had posted on CartoTalk about it, and here it was!

Quite a lot of steps, but straightforward when I started to set it up again... !

[a0r]

Wow, amazing that I had noted down all those steps - I had to redo this analysis/map again now, and I had not kept any notes on it around - but then I remembered that I had posted on CartoTalk about it, and here it was!

Quite a lot of steps, but straightforward when I started to set it up again... !

Does that mean you have new product? Can we see?! This stuff is really great, I'd like to give it a shot sometime, but... not right now.

[frax]

I do have a new one, see below. It is still a work in progress though, waiting for feedback from the client...
 north2north_dec2012.jpg   25.17K   40 downloads

[a0r]

Very cool, thanks for sharing!

[François Goulet]

Hi - there is no requirement that the lines should be realistic. They are not really travels - they represent exchanges between universities around the Arctic, so the actual travels would be routed elsewhere.

 

I wrote a python script that creates arcs from point A to point B...

 

http://blog.fgcartog...-python-script/

 

Could help...